S: (v) infiltrate, penetrate (enter a group or organization in order to spy on the members) "The student organization was infiltrated by a traitor"
S: (v) penetrate (make one's way deeper into or through) "The hikers did not manage to penetrate the dense forest"
S: (v) penetrate (insert the penis into the vagina or anus of) "Did the molester penetrate the child?"
S: (v) permeate, pervade, penetrate, interpenetrate, diffuse, imbue, riddle (spread or diffuse through) "An atmosphere of distrust has permeated this administration"; "music penetrated the entire building"; "His campaign was riddled with accusations and personal attacks"